Battery Operation; Low Battery Indicator - Nellcor N-395 Operator's Manual

BATTERY OPERATION
The N-395 has an internal battery that may be used to power the
monitor during transport or when AC power is not available. A
new, fully charged battery will provide at least 2 hours of
monitoring time under the following conditions: no audible
alarms sound, and no analog or serial output devices are
attached.
Note: Whenever the monitor is connected to AC power, the
battery is being charged. Therefore, it is recommended
that the monitor remain connected to AC power when
not in use. This will make available a fully charged
battery for use at any time.
The monitor cannot operate with a fully discharged battery.
Before attempting to turn on an N-395 whose battery charge has
been depleted, first plug the monitor into an AC outlet to allow
the battery to charge for a few minutes. The monitor may then
be powered on.
To charge a dead battery, connect the monitor to AC power. A
full charge takes 14 hours while the monitor is turned off.
When all of the following conditions are present for 15 minutes,
the N-395 will automatically shut down:
Monitor is running on battery power
No buttons have been pressed
No pulse has been detected (for example, when no patient
is connected to the sensor or the sensor is disconnected)
No alarms are present (other than low battery or a non-
correctable error)
Low Battev indicator
The Low Battery Indicator lights and a low priority alarm begins
to sound when approximately 15 minutes of inonitoriiig time is
available on the existing battery charge. This alarm cannot be
silenced while operating on battery power.